Okamoto, Hazuki

岡本葉月 / オカッパ

Okappa is an underclassman of Nee-san and a member of the Model Club. She is Makimaki's classmate and sits beside her in class. While generally levelheaded and calm, she tends to become extremely violent and monstrous in response to Nee-san's antics. Nevertheless, she displays a gentle and caring side when Makimaki suffers a heartbreak.
She is weak against insects, particularly large cockroaches. She has a model of a train rides on her head.